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+kexec is a system call that enables you to load and boot into another
+kernel from the currently running kernel. kexec performs the function
+of the boot loader from within the kernel. The primary difference
+between a standard system boot and a kexec boot is that the hardware
+initialization normally performed by the BIOS or firmware (depending on
+architecture) is not performed during a kexec boot. This has the effect
+of reducing the time required for a reboot.
+
+Make sure you have selected CONFIG_KEXEC=y when configuring the kernel.
+The CONFIG_KEXEC option enables the kexec system call.